noisy.h

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#ifndef PAGMO_PROBLEM_NOISY_H
#define PAGMO_PROBLEM_NOISY_H

#include <string>
#include <boost/functional/hash.hpp>
#include <boost/random/normal_distribution.hpp>
#include <boost/random/uniform_real_distribution.hpp>

#include "../serialization.h"
#include "ackley.h"
#include "../types.h"
#include "base_stochastic.h"



namespace pagmo{ namespace problem {


class __PAGMO_VISIBLE noisy : public base_stochastic
{
        public:
                enum noise_type {
                         NORMAL = 0, 
                         UNIFORM = 1 
                         };
                
                //constructors
                noisy(const base & = ackley(1),
                         unsigned int trials = 1,
                         const double param_first = 0.0,
                         const double param_second = 0.1,
                         noise_type = NORMAL,
                         unsigned int seed = 0u);
                
                //copy constructor
                noisy(const noisy &);
                base_ptr clone() const;
                std::string get_name() const;

                void set_noise_param(double, double);
                double get_param_first() const;
                double get_param_second() const;

        protected:
                std::string human_readable_extra() const;
                void objfun_impl(fitness_vector &, const decision_vector &) const;
                void compute_constraints_impl(constraint_vector &, const decision_vector &) const;

        private:
                void inject_noise_f(fitness_vector&) const;
                void inject_noise_c(constraint_vector&) const;

                friend class boost::serialization::access;
                template <class Archive>
                void serialize(Archive &ar, const unsigned int)
                {
                        ar & boost::serialization::base_object<base_stochastic>(*this);
                        ar & m_original_problem;
                        ar & const_cast<unsigned int &>(m_trials);
                        ar & m_normal_dist;
                        ar & m_uniform_dist;
                        ar & m_param_first;
                        ar & m_param_second;
                        ar & m_noise_type;
                }

                base_ptr m_original_problem;
                const unsigned int m_trials;
                mutable boost::normal_distribution<double> m_normal_dist;
                mutable boost::random::uniform_real_distribution<double> m_uniform_dist;
                mutable boost::hash<std::vector<double> > m_decision_vector_hash;
                double m_param_first;
                double m_param_second;
                noise_type m_noise_type;
};

}} //namespaces

BOOST_CLASS_EXPORT_KEY(pagmo::problem::noisy)

#endif // PAGMO_PROBLEM_NOISY_H